Surge resistor for protecting active source of variable inductance in a power-factor correction arrangement
First Claim
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1. A power-factor correction arrangement, comprising:
- a) an active source of variable inductance;
b) a first switching circuit switchable between open and closed states, and operative for switchably connecting the active source in parallel across a supply of AC power in the closed state of the first switching circuit, the first switching circuit being connected to the active source at a first switching junction;
c) a passive source of capacitance;
d) a second switching circuit switchable between open and closed states, and operative for switchably connecting the passive source in parallel across the supply of AC power in the closed state of the second switching circuit while the first switching circuit is in the closed state of the first switching circuit, thereby drawing a surge electrical current through the passive source, the second switching circuit being connected to the passive source at a second switching junction; and
e) a surge resistance interconnected between the first and second switching junctions, and operative for reducing the surge current to protect the passive source.
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Abstract
A power-factor correction arrangement incorporates an active inductance source and a passive capacitance source switchably connected in parallel across a source of AC power. The active and passive sources are directly interconnected at their switched ends by a resistance, the value of which is chosen so that, when the passive source is switched into circuit while the active source is already connected to the AC source, the current through the passive source suffers virtually no surge.
12 Citations
7 Claims
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1. A power-factor correction arrangement, comprising:
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a) an active source of variable inductance;
b) a first switching circuit switchable between open and closed states, and operative for switchably connecting the active source in parallel across a supply of AC power in the closed state of the first switching circuit, the first switching circuit being connected to the active source at a first switching junction;
c) a passive source of capacitance;
d) a second switching circuit switchable between open and closed states, and operative for switchably connecting the passive source in parallel across the supply of AC power in the closed state of the second switching circuit while the first switching circuit is in the closed state of the first switching circuit, thereby drawing a surge electrical current through the passive source, the second switching circuit being connected to the passive source at a second switching junction; and
e) a surge resistance interconnected between the first and second switching junctions, and operative for reducing the surge current to protect the passive source. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification